Narrative:

On departure, we entered controled airspace and were climbing up to 3000 ft. Upon establishing contact with ZMP, they replied radar contact and cleared us higher -- apparently to 5000 ft. Climbing through 4000 ft, I conferred with my student questioning 'we were cleared to 6000 ft, right?' but 6000 ft made more sense being we filed 6000 ft and were traveling wbound. Climbing through approximately 5200 ft, center queried us as to our altitude and restated that we were cleared to 5000 ft. We immediately began a descent back to 5000 ft.

Google
 

Original NASA ASRS Text

Title: A PIPER PA34 INSTRUCTOR AND STUDENT PLT CLBED ABOVE THE ASSIGNED ALT NEAR GLR VOR.

Narrative: ON DEP, WE ENTERED CTLED AIRSPACE AND WERE CLBING UP TO 3000 FT. UPON ESTABLISHING CONTACT WITH ZMP, THEY REPLIED RADAR CONTACT AND CLRED US HIGHER -- APPARENTLY TO 5000 FT. CLBING THROUGH 4000 FT, I CONFERRED WITH MY STUDENT QUESTIONING 'WE WERE CLRED TO 6000 FT, RIGHT?' BUT 6000 FT MADE MORE SENSE BEING WE FILED 6000 FT AND WERE TRAVELING WBOUND. CLBING THROUGH APPROX 5200 FT, CTR QUERIED US AS TO OUR ALT AND RESTATED THAT WE WERE CLRED TO 5000 FT. WE IMMEDIATELY BEGAN A DSCNT BACK TO 5000 FT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.